Electrical Specifications
133
November 2002 − Revised January 2005 SPRS205D
Table 5−40. I
2
C Signals (SDA and SCL) Switching Characteristics
CV
DD
= 1.2 V
CV
DD
= 1.35 V
CV
DD
= 1.6 V
NO. PARAMETER
STANDARD
MODE
FAST
MODE
STANDARD
MODE
FAST
MODE
UNIT
MIN MAX MIN MAX MIN MAX MIN MAX
IC16 t
c(SCL)
Cycle time, SCL 10 2.5 10 2.5 µs
IC17 t
d(SCLH-SDAL)
Delay time, SCL high to
SDA low for a repeated
START condition
4.7 0.6 4.7 0.6 µs
IC18 t
d(SDAL-SCLL)
Delay time, SDA low to
SCL low for a START and
a repeated START
condition
4 0.6 4 0.6 µs
IC19 t
w(SCLL)
Pulse duration, SCL low 4.7 1.3 4.7 1.3 µs
IC20 t
w(SCLH)
Pulse duration, SCL high 4 0.6 4 0.6 µs
IC21 t
d(SDA-SCLH)
Delay time, SDA valid to
SCL high
250 100 250 100 ns
IC22 t
v(SCLL-SDAV)
Valid time, SDA valid
after SCL low
0 0 0.9 0 0 0.9 µs
IC23 t
w(SDAH)
Pulse duration, SDA high
between STOP and
START conditions
4.7 1.3 4.7 1.3 µs
IC24 t
r(SDA)
Rise time, SDA 1000 20 + 0.1C
b
†
300 1000 20 + 0.1C
b
†
300 ns
IC25 t
r(SCL)
Rise time, SCL 1000 20 + 0.1C
b
†
300 1000 20 + 0.1C
b
†
300 ns
IC26 t
f(SDA)
Fall time, SDA 300 20 + 0.1C
b
†
300 300 20 + 0.1C
b
†
300 ns
IC27 t
f(SCL)
Fall time, SCL 300 20 + 0.1C
b
†
300 300 20 + 0.1C
b
†
300 ns
IC28 t
d(SCLH-SDAH)
Delay time, SCL high to
SDA high for a STOP
condition
4 0.6 4 0.6 µs
IC29 C
p
Capacitance for each
I
2
C pin
10 10 10 10 pF
†
C
b
= total capacitance of one bus line in pF. If mixed with HS-mode devices, faster fall-times are allowed.
IC25
IC23
IC19
IC18
IC22
IC27
IC20
IC21
IC17
IC18
IC28
Stop Start Repeated
Start
Stop
SDA
SCL
IC16
IC26 IC24
Figure 5−38. I
2
C Transmit Timings